Novel ratiometric fluorescent probe with large Stokes shift for selective sensing and imaging of Zn in live cell.

A novel ratiometric fluorescent probe, namely 5-[(3-dicyanoylidene -5.5-dimethyl) cyclohexenyl-1-ethenyl] salicylaldehyde-3'-hydroxybenzohydrazone (DCSH) is presented for the selective sensing of Zn ion in acetonitrile/water (2/3, pH 7.4) solution.